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(1/2)*(2*x+54) = (1/3)*(9*x+27) // - (1/3)*(9*x+27)
(1/2)*(2*x+54)-((1/3)*(9*x+27)) = 0
(1/2)*(2*x+54)+(-1/3)*(9*x+27) = 0
1/2*(2*x+54)-1/3*(9*x+27) = 0
1/2*(2*x+54)-1/3*(9*x+27) = 0
18-2*x = 0
18-2*x = 0
18-2*x = 0 // - 18
-2*x = -18 // : -2
x = -18/(-2)
x = 9
x = 9
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